When I was very young, maybe 4, my parents were discussing sending my sister and me to swimming lessons while we were driving home from Grandma's house one day. At that moment, I looked out the window and saw the tennis court at a local park. I immediately assumed the tennis court was a swimming pool. For years I wondered how they kept the water in, with only chain link fencing.
A childhood belief about swimming pools

others believed things like this
- I believed that the ladder on the back of a trailer/rv led up to a swimming pool.— marilese
- I used to believe that if you farted while swimming in the pool, it could propel you foward really fast.— Rick
- Up until I was in 3rd grade I believed my bathing cap is what kept me afloat in the swimming pool! Anon
- When I was a kid I used to think the "carpool lane" was an actual pool cars went swimming in— skeez
- I used to think that a "pool shark" was an actual shark that lived in a swimming poolAnon
- I forgot the expression "not cricket", so I said, "not tennis" instead.Anon